Slip-hook.



L. VON RANTZOW.

SLIP HOOK.

APPLICATION TILED 13210.12, 1913.

1,096,126. Patented May 12, 1914.

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COLUMBlA PLANOGRAPH C04. WASHINGTON. D. c

UNITED STATES PATENT OFFICE.

LUDVIG VON RANTZOW, 0F COPENHAGEN, DENMARK, ASSIGNOR TO THE ENGEL- HARDTDECKED LIFE BOAT 00., 0F COPENHAGEN, DENMARK, A FIRM.

SLIP-HOOK.

Specification of Letters Patent.

Patented May 12, 1914.

To all whom it may concern:

Be it known that I, LUDVIG VON RANTZOW, a subject of the King ofDenmark, and residing at Copenhagen, Denmark, have invented a new anduseful Improvement in Slip-Hooks; and I do hereby declare the followingto be a full, clear, and exact description of the same.

The invention relates to a slip-hook of the kind in which the hook whichis hooked into an eye-bolt, shackle or the like carrying the weight canbe opened under the influence of the force as soon as a member retainedin a certain position in relation to the hook is released, so that noextraneous power is required for causing the hook to slip. Suchslip-hooks are very appropriate in cases where two or more hooks are tobe caused to slip exactly simultaneously. This is for instance the casewhen launching life-boats, when under certain circumstances it isdesirable to release the boat from the tackles of the davits just beforethe boat is fully supported by the water.

According to the present invention a sliphook of the kind referred toabove isconstructed in such a manner that the slip-hook together withits supporting frame are adapted to be laid down on the deck of a boat,which is sometimes desirable when a number of boats are to besuperposed, and this in such a manner that the different parts ormembers of the slip-hook do not essentially alter their relativepositions when the slip-hook is being laid down. The active parts ofsuch a hook are retained in their active position by means of a chain orsimilar flexible connection and the object aimed at is obtained in apreferred form of the invention by the laid chain or the like being ledover a guide pulley, the axis of which coincides with or is near to theaxis on which the whole apparatus is laid down. 7 An example and amodification of the invention applied to. the launching of lifeboats areshown in the drawings in which Figure 1 shows three collapsible ordecked life-boats placed one on top of the other, the uppermost of whichis being lifted in the davits by means of slip-hooks in accordance withthe present invention. Fig. 2 is a plan view of one of the life boats,the frames carrying the hook being laid down. Fig. 3 shows a side viewof a single slip-hook and associated parts drawn to a larger scale.

Fig. 4 a front elevation of the arrangement shown 1n Fig. 3, as viewedfrom the left side thereof, and Fig. 5 is a detail hereinafter morefully referred to.

The book shown in Fig. 3 is adapted for being hooked into the eye 6 inthe block 0, by which the boat is suspended. The book a is pivotallymounted by means of a bolt 03 on the frame 6 and is provided with aprolongation or tail-piece f. By means of abolt g in the frame 6 thestays h (Figs. 34) are pivotally mounted the arms of the stays at topbeing connected by a bolt, on which the roller is is mounted. Thisroller in the position shown in full lines in Fig. 3 bears against theunderside of the tail piece f. The stays '72. are retained in theposition shown by a flexible connection m which is led overguide-pulleys n and Z, the other end of the flexible connection beingfastened to an operating means 0 shown in Figs. 2 and 5. As shown inFigs. 2 and 5 the flexible connections from both of the slip-hooks ateach end of the boat are fastened to the same operating means and laidin the same direct-ion around part of the circumference of the disk 0'.The disk 0 is revolubly mounted on an axis p in the deck or athwart and1s provided with an operating handle 9 by means of which it can beretained against rotation by any suitable means. In the deck thwarts orother parts of the boat, lugs a are provided in which the frame 6 ispivotally mounted by means of bolts o.

Then the eye 6 is engaged with the hook a the detent s, pivoted on thebolt or thumb screw m Fig. 3, prevents the eye from leaving the hook bychance before the runner in the tackle has been tightened, the detent .9being prevented from turning by the said bolt or thumb screw.

The apparatus acts in the following manner: When the parts are in theposition shown in Figs. 1, 3 and 4 the boat can be hoisted up, swung outand lowered. The hook a is prevented from turning on the bolt (Z, by theunderside of the tail piece 7 resting against the roller 70. Theunderside of the tail piece f is of a curved shape, and the stays h forman angle with the underside of the arm, which will produce a forcetending to cause the roller 70 to run along the surface of the tailpiece and press the arm it toward the position shown in dotted lines inFig. 3, from which, however, it is prevented by a strain in the chain mfastened to the disk 0, which strain counteracts the operation. It isunderstood that this strain can be given a suitable value in relation tothe weight or force acting on the hook a by choosing the curved shape ofthe engaging surface of the arm 7 and its angle with the stays h inappropriate manner. hen the boat has been lowered to a suitable distancefrom the water level, so

that it is not yet water supported, the arm 9 is lifted and the disk 0is thereby released, and will turn under the strain acting on theflexible connections m and both will be alike eased off at exactly thesame time, so that the rollers run off and release the hooks, wherebyboth devices are released simultaneously and the boat falls in the rightmanner down on the water.

When the hooks are not in use, the frames 0 are laid down, being turnedon the bolts 2), so as to assume the position shown in Fig. 2. Thus theyare not in the way when it is desired to put a number of boats on top ofeach other as shown in Fig. 1. The chain at is hereby bent over theguide pulley Z which is arranged close to or in the line connecting thebolts '0 so that the relative positions of the parts of the slip-hookare not essentially altered when the frame of the slip-hook is laid downso that the slip hook is always ready for use, 2'. e. the hook member acan not get out of its active position.

By constructing the slip hook in the manner indicated, in which thereleasing takes place by means of flexible connections and lockingdevices and the weight in the boat the chains taking up but a. smallfraction of the strain, the result is attained that a contemporaryreleasing of a number of slip-hooks can be effected with much greatersecurity than by constructions in which self-barring mechanisms areused, which require positive power for operating the releasing means,and the arrangement described according to which the hook member a isretained in its active position has th advantage that no loss of time Ortrouble is incurred by adjustment of the parts when the slip hook is tobe used in a hurry.

Having thus fully described my inven tion, I claim as new and desire tosecure by Letters Patent:

1. A slip-hook adapted to be laid down around an axis, comprising aframe, a movable hook-member, supporting means for holding the said hookmember in its active position, and a flexible connection securing thesaid supporting means in their active position independent of theposition of the said frame.

2. A slip-hook adapted to be laid down around an axis, comprising aframe, a movable hook member, supporting means for holding the said hookmember in its active position, a flexible connection securing the saidsupporting means in their active position and a pulley turnable on anaxis substantially coinciding with the above named axis and guiding thesaid flexible connection.

3. A slip hook adapted to be laid down around an axis, comprising aframe, a movable hook member, a stay holding the said hook member in itsactive position, a flexible connection securing the said stay in itsactive position and a pulley turnable on an axis substantiallycoinciding with the above named axis and guiding the said flexibleconnection.

In testimony whereof I aiiixed my signature in presence of twowitnesses.

LUDVIG VON RANTZOVV.

WVit-nesses CECIL V. Sonon, VIceo BLoM.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. 0.

